SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e010260595a0341cf26beea114cb2fdacd9c6480c1fe92dd32d7c7934d65a007' 
  AND token = 'vvafoRbGyCwiYSJ8ZIZLvk/1rglzVhTPgAwp0mrN6Fk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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