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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc7cc24c18ac10c4c6ae17003b1c71e7b62753b424e85bc5e02d9171f92e07ca' 
  AND token = 'RgfyXegyrg4dYl9cEvhh/MXZDCy/n6gLKkTAw+E2O7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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