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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b77d9326cb5f77280a5dc8658a83726c7667bc483316adce4b5d99ca53de094b' 
  AND token = '/yt61bNgXTD+Lnu1YeXUdTSw8jV3gSQkbffGaR4Wrrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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