Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a218d5a4f0a61a639f0b04a004701ee0889a13d9ab5422be03c48220aea09d86' 
  AND token = '1+oWWIpjAp+TLF7Fk1BSa8IEjAUe7kBgMfDoBlVXb6g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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