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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e1107cbd5d9cc59f36bf0917f714b058a80d42af8c9be428aaad93fa2870038' 
  AND token = '3DQoLUGI7y/x01LFTJorspOzJA0u/8bI5FChShWwpW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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