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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25066098d32a3d6b869f10fb5af011763fe507ba3e2421139823263286657e95' 
  AND token = 'naIYxQ5vhwwsar9DIrfzrwUl75NYRKzyasb9780qBkU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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