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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '363f2b4209da4d8ded24f9cd3ef90b2e60f9bd71d900a7fadb0090d1a86cc34e' 
  AND token = 'DoNHhYnTnDYxbOQsjP1fETKjVIp9Wzwp36uVl0nukpg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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