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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c25f03574eed7927e983747fae6c9d07d80cffb34ac41058fcf5569237207b' 
  AND token = '/alv1qZfDJx965Go9tIz4TEqNq+cM90p3NB7VKMb2ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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