SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f18c034349f227e26a637902885cf7d72fbc1cd908a3bdc53f825e34052d21a' 
  AND token = 'WvglKUZcF9xFp/quEgNzEPSVm2tbVQ9MdQpanI8wKrM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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