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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79cde8a50058540c2d1adf09b8d0a17bf99788d27a3c8641cc0d610dffcbfa3c' 
  AND token = 'qrQH5AVKRy3GDIXMbT52cLUIeUrGZ+yjRJ1ko4SSfQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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