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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13eb35f87e52cd253ab85d56619749aa2151aaa8ca18843f4edfb0eb2c2f2457' 
  AND token = 'lBI7e6u2V9KT5YwxteexJMkAXUVVrA8jUa1AOwZshwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}