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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d36473e9d07f99b56c0e8d7cdad483e465165a182f057a2b98cc07e79bcb96a' 
  AND token = 'lRijx1lqOx9MA/rrUTp7JPIQk7Nnq5xzOuNRlCkNvFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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