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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b35f90d04f69eb01b4acb9b4cd8aeb9a265794a4e677ff6e22a96c7738946db1' 
  AND token = '6CNcVS6Eyb2yxzD135sECG6+7rLB/4zgYiI+Eo+LJRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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