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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b623c40d5f25ac6f1e52ce576df5666725f155a7077cd0112ae211693129de34' 
  AND token = 'ZmoeLu+S7w5uBcaKHiWs3nzkUEXPwAkXuOBV5Y6lJhs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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