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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '857c7f93d41842b445625ae4152922aa11fe5ab654cac7d6ed16d2a106370bb8' 
  AND token = 'M7i5Tnn9df27A6a4ouPiaiAflm3Z6LzIuh1gnpb3hr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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