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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06190a96b7edc3d0a4a409f3fc29b091b9c8e29f1545308d5fbad92cea8d47c3' 
  AND token = 'H3ws7YtUwN5upuI4MYqXbnzJXVrSgSzDXfmcIj4e9gk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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