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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6675b9cdb04ba748544b5753d39904bd6a2a9805233bdf0089a96eb8f64b7f6' 
  AND token = 'B/2ovTlQinc8nrbwKm8rVVyQILOtPb9s5m4qcPqf45Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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