SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f589d4ed7e294bbc856bf9aff122377b8ced8ccae63063e3fc67c5d12bfd748f' 
  AND token = 'Tp3x3ODdSwJJZP5czKuiynnLTyguIJ5T0Rifak1Q/QQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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