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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16d2c554407f120c6f733a2f08e4b6e6b048aab6755779a943cd5e7e8ccddb5' 
  AND token = 'AgllmmMg2+1FiKrdu8TbOPpmCLTX44fjZuoODXBxLrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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