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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56ecd7466378bf200f9ed1bad4b9fe57a5819f47dc4f780aa289c9d8edde2373' 
  AND token = 'wUm+inQcasDNJ6Ak72PueORmg2sjbVplxgWpaaInqC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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