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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f06e9b53130ad70e0234154073c4ce294ed673a71bb77f17b77648460caef24' 
  AND token = 'DAg0mmHuN+5+9FybMtmttr5lyIosfJjCmNsnXpF6a5k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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