SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '431bee702e855510ac2eb56c6ef8ff4097e1b249a4c9bb79b6771f58f3c1dc93' 
  AND token = 'rOsMoaMaVB+zlPZgvtOzuzvYrpekTgLLT+Yj30W7Q7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00093

JSON explain

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