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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bd966f94cbb92bb6e1348424e9fd4a23d648319f5bc15c60c1e43a8230d02e0' 
  AND token = 't4RqJM/XbHgaBEdYj2Teg2iqI77jtJBHwR8C7I1R7Iw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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