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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ec0e2440b311e1214799d26384251bc5c2f384b77ad96985e93edf9ab400af' 
  AND token = '9dEEB37cH5ptvlIBYtnjdyb91ICW2MzDNo0l1lqDK6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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