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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd741baa802a98341a75bbac7e75e2037ed0698072c36484654f5c3f7b7c4734e' 
  AND token = '9vDQjU17e9MXgqX/yp/KA7jHz+nHQx0gx6waUyKmyEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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