SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba7b58ca17ded89e84d85eb24f02e09c37125a6b8b639207eb6657a20365aa34' 
  AND token = 'YmSjLICyZshrCQwka9yB8yXKTKZLvLXFXJZFX6ifpnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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