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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc1664cc4e335db0605efa229fdacd1f04ee0cec29d42289a47f1e7035195b1d' 
  AND token = 'm+D6xwPA1SQ9DxRWKvzOlE0J/TYXFUUBK2rNP/qeN8Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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