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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff90950e580a556f4b1dea042f9cd67cd9d9126ffe3a95f9022adeb482ea51e' 
  AND token = 'J65W1s3B0TwiOKaGaEJm29P6ykwWV+X1pGntHg6jeuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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