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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3644eca84fc83791aa31254d8efbdfcdde22f47ed1b5fc5123b4f7f68592237' 
  AND token = 'ebkW/s5WlVN0RBKrq51eyVmJTvQroXGCXwj7CGeDMN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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