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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '957c2e68ff08b90ef6fd476cdd008484fc86a6291a43abf63ef2f64e5e724d00' 
  AND token = 'ZYCbzIwxW4Go3PycJhNGEara0fMCaAIS5WhNxr+LHnU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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