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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24222cfa12f72518c2fb4c104f92f4556a086737b07d694a28ecb81987f60085' 
  AND token = '2Q+nCRobxBF2E/0gxwH5qyIoLN62QJ+Rw7DVjYjy13o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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