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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '689540533bddfe578a97440ee38396d348badefe45b3c4b0e17edd71868530ee' 
  AND token = 'dNH1k+FslRSgDqCVA8KlhE697Eq5d8jyBasKopCgmQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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