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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a814f16fd36f15e60fbca1406d38641c079c148863add716b64792f2f53429f0' 
  AND token = 'muHQUbot4P7PKaclReJzLZhk3CDDSZfE14tMsUeNqeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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