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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a780b9439aeac888d38697c37c1f487eff6fa9c77c7ed2561243421725c2084b' 
  AND token = 'ZrrjuEOyYke36QMIFddRn3uao2lypThrVAMT5rutOpo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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