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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f76c31f3da19c79e1a9e72aa0adbaeb3007b7016cffe57c9dd489c6c15f0e14f' 
  AND token = 'WsijG7hMvf8h5C/PKUklZPPAZaT6N+ovJud19WGuXSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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