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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5ddc3d85a6eabce35578fb1ae1d60ffb4a8175377e8fa19db1741406a96d62f' 
  AND token = 'ab7iskVenlBO0uQPnNnY5VIbemqOcSFjjCPzWPjl0A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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