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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f79e6d5b4f3928780287cac0c18bbf9e09c762c626e3face82b2b3b7750574' 
  AND token = 'kbMxeqLEujCxvyvUGcBLBPMGZ3HNhofDrgr2o11Wn9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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