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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b23b71c459acd58afac1b0b8266f20aa01fa5f252f455f6d5eaa57a6efb4035e' 
  AND token = 'hLQGwFtuu2PxTk846lWk0GVRWTtQel3tfpLxUPxT3k8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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