SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7692da5fc3f1a094c554294f1e33e1bdef06f535aed5e05d86ec6b5e1cebf7d2' 
  AND token = 'JIp/vHQlasMKdknquklOYPc+Ja9+jtm+/Z/gw48dgMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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