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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e84dda46ea1f4e8f1f38d7148e58909f437056eee36cbd4a33a2d4abb7fd30a' 
  AND token = '12kdK4rNGf2i25DAZcTPxapiI9NV2rTA8MPpLqEoJY4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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