SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38069a658b2ce3f5db7690cb8af9489b2bd48738871ce585bfc9a02e6f224786' 
  AND token = 'V1vu2qELYUpML9q3pialK9+wfu6ixEZuG2JGTGDSTbM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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