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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a083492389c733193dd210c5967641b1413195ef08837b2e93ae28b3ed315ca8' 
  AND token = 'axP+G59OrJcg2q19yFXWWp2WBaNUA6qGufSN3LCkPn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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