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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebd20f41c5263cc1b6e33a6aca9ff91f8530439181e3cb6298402872a44b3664' 
  AND token = '0Rz0ThDdsjIbXEyB8IJGaL5rFtd3LAhymavwVX9YQ4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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