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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e15b7d37a8b693e887906817b624248f21c336b5b29d75167e6cdd9a2e9d9e52' 
  AND token = 'faPcHkcflaJLV89RJxW4iehLWGiNoaWNynYpfZSlv6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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