SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd633fee03cfdec024a0c97937460021bcc5661e49a58dcd17caeacb7bfbcc07c' 
  AND token = 'vu9gTQX1qaKJ2CXbL92/k+hgp7yg8VPzIHh0h+l7FBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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