SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ca16d4379643779c4681ff05c1ee897ffd60d8d41ac47c301cccee2a61d45b3' 
  AND token = '9ySrwYKh5M0rm+XVcJE5hKqzTtLv84x/VF8RY3GqlI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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