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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e9d8efe60cbd3f776deef9bfc6ce15f0a2f331a69454796ff6732f02d6f8935' 
  AND token = 'Yp21jzXTMAkXo1Ic4stt2qTZq2SRZpeXh37joCV/BcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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