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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a936efb74f6b00a394b3f9cba30190f71b14e5bb6a57ae636a2072e5121f661e' 
  AND token = '2Y7iMX8hqZrtgkSdO4XV9Rl3UkQwo3gZpnwqDcdHqxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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