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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ba652fea322eeee3e3bb5a4ff14af9218682927effe75d253a778c5c597001' 
  AND token = 'CfoRWl6W/kIK2W69uQrtiCzUaVrv0urzH80bxRzX6s8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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