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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d76b7a1b0501fbccc22ee545a5d6896a8dae98be31108b01483e9e0baa326cb' 
  AND token = 'LvZe5q+Yn84DSduDC91IuGy32L/u0BW3K5NNx9zqU0M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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