SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72f7577c05e77816f5d9c9a0a0cd9ecc7d2bc546bd54dc21fe18f0a18531ab4e' 
  AND token = '+wYVEFKeQoZ3YsYM3n1sv/1VnpD0taJvFjEoL4PIggI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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