SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '10862f2321bf1b976bc43be18990c52fbfeef043b73f945874c26d49a4c9e86e' 
  AND token = 'ql88Z6uV4eJJO5jgAhX4lGj4FJTdi4pvQHPdD7YMnV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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