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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fd3f0a3e48978c8bec6eaed067dc7bc6a7090d1e317c69cb5c7c705381e9e6' 
  AND token = 'X5qse1b6u/tcvtNaAIqG4iDHIwWPQW0TloFHOs7Jw6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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