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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6152f0d6e47373f0f99dc18b5d15304e8d4bacfdce69b11de218cadf9506c671' 
  AND token = 'Q2qrAV5Q+OlYe0TOBUwYsKVfdjI2UUWa95apjXWAmug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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