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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd814b3e9633ae93367d49feb64afa87f3752b7c24e94fce48616ac700a939edd' 
  AND token = 'UpkN+Iomh5b9CGyM+m6sITEwhgU5Q46pvc6ITfJ4P/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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