SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e02650bf5f4aa47909cdf9735d76e31453a632c2bdb5309f662202de93edc1d' 
  AND token = 'pulWOINqaTvX5KynTEjjzs5bj9Lmga4Z8hzwuQ/3KiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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