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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c170c132195f0119b0b881d6ee78dd4f28b850124b4868e9b55c1538166b00c4' 
  AND token = '8LTZz2W2rUZ/ignItwYw3EfhiMn7nVc3ysxJrelAmys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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