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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8bbfb658199ffbd7190f504e8c4f48ab0ee103697b13f98ef00a361211a7d9c' 
  AND token = 'Z1+wQrDmPS66bQI0yugC8Z3M4fG7OOLz9QWH3i0IFDM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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