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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62a7c45417f7ab82a1759ae833d6f61f33a4c101a593769c3f50a3951c595be3' 
  AND token = 'tXN7MC8v0AK3ok8qY69XMIHtEBD6K8kOYhqml/LeH8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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