SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9545fa30f871b87366a31f7ae1b772d8e1aba2c56dce537dbb86b7443799bad' 
  AND token = 'jumpODcMQtKVzUNRYHhOPkmQZrk7P7J6MftwvUk5qDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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