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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fac2400b50f427e655a65a789ef3e59f984edc98143777d5a730f3b393f3f0a' 
  AND token = '9nOwb8mA36fAB0VgokOWwf0svq0/QQ9SINdUfgyY4MY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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