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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d0b19ad939a092dbeed2ac10a3000af8ba17ce36672f46df8cb165abe39ae4d' 
  AND token = 'Q/Iie47D26XhNkzoVd9gW/Vf8I6dLOKoUtYHZoTVvCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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