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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71d87cdae84b5bb5436f59663a8f38a7090d405a418256d28134044b8cc548cd' 
  AND token = 'bmb1FFSO6km3SR91b/1M9BcmCntFsWqjFn4H3iTR/dA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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