SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72a21d662f821c25d42f243ab50b7e4b190da10bef6f53cb79d1f2ca97f69da3' 
  AND token = 'FuSm1umKMGVBNwjtNHP6Ou9RufjzRnJfIXw4B+gsFas=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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