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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afb420fe8816c4a15ec3d43558f5b0767a4bda653cf5a881e144b880cba3c98f' 
  AND token = 'KRq3PjlU6cXeQoNN2vypj5XzwXSGJ0jccg/HgqaIDxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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