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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd571673686807be940c7d2bb2335a6716ebb2f0a11eed0f854d09b59e11e8db8' 
  AND token = '40A5izjmikDaozRSYuVobc15N3Gq2WzWt6Dh+ahnd+Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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