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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91d0d7be72fb616d70ffab67e9fa0a01b0a9f3085750e71f938e301aa9020d9f' 
  AND token = 'P7WE5fzBqzNxK0lg56qXflaW1KDDx6a38Vem+9PKEnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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