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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '22d7628b44703890094e8f862ee370228e9687141ee77a7fd74ad4a26d2839d0' 
  AND token = '71LIuJL5XrurhzvF9i8V7IFrnt+7I8qOm+Cqd3JX4wg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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