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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '394f62c28c60e1771301073469a22566e298a400584895e70e64f965b9ecdb3b' 
  AND token = 'jbsRV85ubPglrt7/wkjH8XgdpzY9suegLBTv85okcM4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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