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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33c4e8712db3ab7bbf411aa670c553f10249656990c333c5469030dbd28a9c8d' 
  AND token = '8k6eW0kPHdnGhGQsDO3XWG6eft4PCc7eqc0bx9G/M5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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