SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0296813027623724a17f77406a80791fc09d8e789dfc7de0e4426ed8a510ea93' 
  AND token = 'XvzlOovPnBUXaS+B6w2pJWZFTkNWb0Z2E21mdnY9ZQU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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