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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27350d12200d9f380abeadc0214c92239ad7c38f37e957fb86ed677a83b8bc0c' 
  AND token = 'YF38dhC88L5cOxeMt1aPGFpAXKfrI9tKaNoGbzbPf2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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