SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e046891c61d482028ea5fd874b4e58a276ad3cc5b61fbfce99c00730b463291' 
  AND token = 'yv8Fl0NQiJBseYGRYNbKLh/9rm9DiDr/Eg42plrIl5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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