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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec22fde6363473e5527f9f189e2d8139f58db530148f06d55196898ddf63971c' 
  AND token = '4REfH1NpVP08zhYXAD25ZTdNHR1aSnSTfIkwVKJM5V4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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