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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11d7ee96c84d92ec1dfa9f25bddebc93ca60223d301baac06fdba1eb68464b60' 
  AND token = 'goC7vg9bE3h38OrgEolAs5ttTTAc+eEWoO/mauD/w64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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