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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'acc84479a6b77eae9a111ea06b32bac027079e753883834455409f8828e726a2' 
  AND token = 'VU5kJX/p+UXqtj2WLOi0F//irRQvncXDNutGDWCh3c4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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