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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b807d96083b59328731b30dde363d87043f5670c6e4fd3f70c982ba2dbdfb9' 
  AND token = '0WAF/WiBkAU0dzDEM25EhooaWA/P0rc/ufZIOvRwpWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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