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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0857c0fcabf096652a71d5a20785663cff79ba3c8f64a8982faf5a185850121b' 
  AND token = '/DJGUagUvFbLmy79nEKmv1pC9p+eryYGYcu8v7iiW6w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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